Removing drum parts from music21.stream before processing.

[napulen]

Fixes #79

The chosen strategy was to look for music21.stream.Parts with a PercussionClef object within and remove them.

This is done only in the score_parser because it shouldn't affect annotation files or synthetic examples. Those will never have a percussion track.

[codecov-commenter]

Codecov Report

Merging #80 (ce830b0) into main (0c91b48) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
+ Coverage   74.95%   74.98%   +0.03%     
==========================================
  Files          47       47              
  Lines        2380     2383       +3     
==========================================
+ Hits         1784     1787       +3     
  Misses        596      596              

Impacted Files	Coverage Δ
AugmentedNet/score_parser.py	96.96% <100.00%> (+0.07%)	⬆️

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